Bài 1:

cho hàm số y=x+1 (d1) và hàm số y=4-2x (d2)
a) vẽ (d1) trên mặt phẳng tọa độ Oxy

b) tìm tọa độ giao điểm A của (d1) và (d2) bằng phép toán

Bài 2:

giải phương trình sau: \(\sqrt{4x^2-4x+1}=7\)

Nội dung nào sau đây không phải mục đích của “Chiến lược toàn cầu” do Mĩ đề ra?

3/ Cho nửa đường tròn tâm O có đường kính AB. Gọi Ax và By là các tia vuông góc với AB (Ax, By và nửa đường tròn thuộc cùng một nửa mặt phẳng bờ AB). Qua điểm K thuộc nửa đường tròn (K khác A và B), kẻ tiếp tuyến với nửa đường tròn, nó cắt Ax và By theo thứ tự ở E và F.

a) Chứng minh: Góc EOF=90 độ

b) Chứng minh:  EF = AE + BF

c) cm: OK bình =AE.BF

2/ Cho đường tròn (O), điểm K nằm bên ngoài đường tròn. Kẻ các tiếp tuyến KB, KC với đường tròn (B, C là các tiếp điểm)

a) Chứng minh: OK vuông góc BC tại H

b) Vẽ đường kính CD của (O), MD cắt (O) tại E. Chứng minh

c) Chứng minh: KH.KO=KE.KD

1/ Cho đường tròn (O), dây AB khác đường kính. Qua O kẻ đường vuông góc với AB tại K.

a/ Chứng minh : góc AOK = góc BOK

b/ Tiếp tuyến tại M của (O) cắt OK tại C. Chứng minh: Chứng minh CN là tiếp tuyến của đường tròn (O).

Viết bài cảm nhận về cuốn sách hay"lớn lên cùng sách"

cho đường tròn (o) dây AB khác đường kính.Qua O kẻ đường vuông góc với AB tại K
a/ chúng minh góc AOK = góc BOK
b/ tiếp tuyến tại A của (o) cắt OK tại C. chứng minh: CB là tiếp tuyến của đường tròn (o) 

Singapore is a country in Southeast Asia. Until 1965, Singapore was ruled by the United Kingdom. In 1965, they gained their (1) _______ and established their own government. Singapore’s economy is very strong in a number of different areas. (2) _______ its large and centrally located port, import and export is an important part of Singapore’s economy. “Import” means bringing items into the country and “export” means sending items out of the country. Many of the goods imported and exported are electronics and technology or are related to chemical, oil, or medical supplies. Another area that is important to Singapore’s economy is finance. Singapore is the world’s (3) _______ financial center after New York, London, and Tokyo. Over 10, 000 companies from around the world have offices in Singapore. As a result of having so many multi-national companies, nearly half of the people who work in Singapore are
from other countries  Singapore is (4) _______ for being a clean and safe country that has many
interesting sites to see. Thanks to its diverse economy, Singapore is very wealthy nation.
In fact, it is one of the top ten richest (5)  ________ in the world. Many people in Singapore are millionaires (6) _______ some are very poor. It is a small country but serves as a model for other nations when looking at their own economies

1. A. dependence B. correspondence C. free D. independence
2. A. Despite B. Due to C. Because D. In spite of
3. A. four-largest B. largest-fourth C. fourth-largest D. forth-largest
4. A. well-known B. considered C. impressed D. dangerous
5. A. nation B. continents C. countries D. provinces
6. A. so B. because C. however D. but
 

Spending your free time on the Internet can be fun. You can chat, share photos with friends, and play online games. But some people are addicted to the Internet. They just can’t turn it off.

Being online for many hours at a time does not mean you have a problem. The
Internet is very useful. Online, you can pay your bills, buy clothes, and read the news.
There are many good reasons to spend time online. However, people with an Internet
addiction are online too much. They don’t spend time with their friends and family.
Instead, they spend their time chatting with their Internet friends, people they have never
met in real life. Some also play online games all day or night. Some people with Internet
addictions even leave their jobs so they can spend even more time online! People with
Internet addictions don’t just go online to shop, have fun, or do work. People who have
this problem often go online because they want to escape the stress and problems in their
lives. Many internet addicts stop caring about their real lives, and focus only on their
online lives.

One way Internet addicts can get help is by using special software. This software
controls how much time someone can spend online. It tells the computer to turn off the
internet after a certain amount time. This helps people focus on real life. The software’s
goal is to teach people to use the Internet for good reasons and not just as an escape.
15. People with Internet addiction spend most of their free time on the Internet.
16. Internet addiction causes problems in one’s daily life.
17. Most Internet addicts play online games all day or night.
18. Using a special software is a way of helping people stop their Internet addiction.
19. What is the main idea of the article?
A. People should not spend time on the Internet
B. The Internet is very good for people
C. Spending too much time online is not good
D. Families should use the Internet together.
20. According to the passage, a person is most likely to become an Internet addict is
that_______.
A. their life is stressful and has problems B. their job is boring
C. they enjoy online gaming D. they have a lot of online friends
 

English is the most important language in the world. More than 400 million people speak English as their mother tongue. Another 400 million speak it as a second language. No one knows how many people speak it as a foreign language. Chinese is the language with more speakers than English, but it is only the language for more than one billion Chinese people. English is the official language on 20% of the land area in the world. It is spoken in North American, Great Britain, Australia, and New Zealand. In South Africa and India, it is also one of the official languages. In many countries, the textbooks in universities are written in English. More than 75% of the world’s mai is composed in English. More than 60% of the radio stations broadcast programs in English. English is the language of international communication

A. Decide whether the statements that follow are TRUE or FALSE.
1. China is the most important language.
2. We don’t know how many people speak English as a foreign language.
3. English has more speakers than Chinese.
4. English is spoken in North America, Great Britain, Australia, and New Zealand.
B. Circle the best answer to each question.
5. Many people in the world use English as an important ________
A. subject B. language C. country D. source of power
6. In many countries, people use English to _______ textbooks in universities.
A. read B. make C. write D. advertise